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The LIGO-Virgo and Fermi collaborations recently reported a possible jointdetection of a sub-threshold gravitational wave (GW) event and a sub-thresholdgamma-ray burst (GRB), GBM-190816, that occurred 1.57 s after the merger. Weperform an independent analysis of the publicly available data and investigatethe physical implications of this potential association. By carefully studyingthe following properties of GBM-190816 using Fermi/GBM data, includingsignal-to-noise ratio, duration, f-parameter, spectral properties, energeticproperties, and its compliance with some GRB statistical correlations, weconfirm that this event is likely a typical short GRB. Assuming its associationwith the sub-threshold GW event, the inferred luminosity is$1.47_{-1.04}^{+3.40} \times 10^{49}$ erg s$^{-1}$. Based on the availableinformation of the sub-threshold GW event, we infer the mass ratio q of thecompact binary as $q=2.26_{-1.43}^{+2.75}$ according to the reported range ofluminosity distance. If the heavier compact object has a mass > 3 solar masses,q can be further constrained to $q=2.26_{-0.12}^{+2.75}$. The leading physicalscenario invokes an NS-BH merger system with the NS tidally disrupted. Withinthis scenario, we constrain the physical properties of such a system to producea GRB. The GW data may also allow an NS-BH system with no tidal disruption ofthe NS or a BH-BH merger. We apply the charged compact binary coalescence(cCBC) theory (for both a constant charge and an increasing charge for themerging members) to derive the model parameters to account for GBM-190816 andfound that the required parameters are extreme. Finally, we argue that the factthat the observed GW-GRB delay time scale is comparable to that of GW170817/GRB170817A suggests that the GW-GRB time delay of these two cases is mainlydefined by the time scale for the jet to propagate to the GRB emission site.

Physical Implications of the Sub-threshold GRB GBM-190816 and its Associated Sub-threshold Gravitational Wave Event